331 Area Code

N Illinois

June 19, 2019

Area Code: 331
State/Region: N Illinois
Major Cities: western suburbs of Chicago
Time Zone: Central
Current Time: 11:28 AM
Date Assigned: 7/23/99
In Service Since: 10/7/07
Overlay?: Yes
Overlay Complex: 630/331
Local Call Dialing: 1+10D
Toll Call Dialing: 1+10D
   

331 Prefixes/Exchanges

Prefix
Location / Company
Company
Assigned
331-200
BARTLETT, IL
T-MOBILE USA, INC.
07/11/2011
331-201
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
01/06/2012
331-202
ELMHURST, IL
SPRINT SPECTRUM L.P.
01/17/2012
331-203
AURORA, IL
SPRINT SPECTRUM L.P.
10/12/2011
331-205
AURORA, IL
T-MOBILE USA, INC.
10/21/2011
331-206
AURORA, IL
SPRINT SPECTRUM L.P.
10/12/2011
331-207
YORKVILLE, IL
LEVEL 3 COMMUNICATIONS, LLC - IL
11/01/2011
331-208
AURORA, IL
SPRINT SPECTRUM L.P.
11/08/2011
331-209
ELMHURST, IL
SPRINT SPECTRUM L.P.
01/17/2012
331-210
ST CHARLES, IL
PEERLESS NETWORK OF ILLINOIS, LLC - IL
03/06/2012
331-211
[UNASSIGNED]
331-212
AURORA, IL
MCI WORLDCOM COMMUNICATIONS, INC. - IL
04/05/2012
331-213
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
09/06/2011
331-217
[UNASSIGNED]
331-220
AURORA, IL
SPRINT SPECTRUM L.P.
07/12/2011
331-221
ELMHURST, IL
AMERITECH ILLINOIS
01/21/2009
331-222
ST CHARLES, IL
DENALI SPECTRUM LICENSE, LLC
10/28/2008
331-223
ST CHARLES, IL
DENALI SPECTRUM LICENSE, LLC
10/28/2008
331-224
[UNASSIGNED]
331-225
ELMHURST, IL
SPRINT SPECTRUM L.P.
08/22/2011
331-227
SUGARGROVE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
08/11/2011
331-228
ST CHARLES, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
09/21/2011
331-248
GENEVA, IL
COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL
07/06/2007
331-256
AURORA, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
09/13/2011
331-262
AURORA, IL
SPRINT SPECTRUM L.P.
07/30/2008
331-309
[UNASSIGNED]
331-311
[UNASSIGNED]
331-312
[UNASSIGNED]
331-330
NAPERVILLE, IL
DENALI SPECTRUM LICENSE, LLC
08/19/2008
331-331
[UNASSIGNED]
331-332
NAPERVILLE, IL
DENALI SPECTRUM LICENSE, LLC
11/03/2008
331-333
NAPERVILLE, IL
DENALI SPECTRUM LICENSE, LLC
11/03/2008
331-411
[UNASSIGNED]
331-422
ST CHARLES, IL
LEVEL 3 COMMUNICATIONS, LLC - IL
11/13/2008
331-425
AURORA, IL
T-MOBILE USA, INC.
07/11/2007
331-431
AURORA, IL
BANDWIDTH.COM CLEC, LLC - IL
05/26/2010
331-442
ST CHARLES, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
10/30/2008
331-444
NAPERVILLE, IL
CYGNUS TELECOMMUNICATIONS CORPORATION - IL
08/04/2010
331-452
AURORA, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
09/20/2007
331-454
AURORA, IL
DENALI SPECTRUM LICENSE, LLC
05/07/2009
331-456
ROSELLE, IL
GLOBALCOM, INC.-IL
12/05/2007
331-457
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
11/14/2008
331-462
LOMBARD, IL
XO ILLINOIS, INC.
08/23/2008
331-465
W CHICAGO, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
10/17/2007
331-472
NAPERVILLE, IL
T-MOBILE USA, INC.
10/22/2008
331-481
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
10/29/2008
331-511
[UNASSIGNED]
331-551
LOMBARD, IL
DENALI SPECTRUM LICENSE, LLC
11/05/2008
331-555
[UNASSIGNED]
331-575
AURORA, IL
SPRINT SPECTRUM L.P.
09/18/2007
331-588
ST CHARLES, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
02/15/2010
331-591
[UNASSIGNED]
331-611
[UNASSIGNED]
331-618
[UNASSIGNED]
331-625
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
10/16/2009
331-630
[UNASSIGNED]
331-642
ELMHURST, IL
BANDWIDTH.COM CLEC, LLC - IL
331-643
AURORA, IL
SPRINT SPECTRUM L.P.
09/18/2007
331-645
ELMHURST, IL
SPRINT SPECTRUM L.P.
11/05/2007
331-684
AURORA, IL
SIGECOM, LLC - IL
07/12/2007
331-700
[UNASSIGNED]
331-708
[UNASSIGNED]
331-711
[UNASSIGNED]
331-725
OSWEGO, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
331-773
[UNASSIGNED]
331-777
DOWNERSGRV, IL
CYGNUS TELECOMMUNICATIONS CORPORATION - IL
09/22/2010
331-779
[UNASSIGNED]
331-811
[UNASSIGNED]
331-815
[UNASSIGNED]
331-825
GENEVA, IL
DIGITAL NETWORK ACCESS COMMUNICATIONS, INC. - IL
11/08/2007
331-826
ELMHURST, IL
SPRINT SPECTRUM L.P.
11/18/2008
331-847
[UNASSIGNED]
331-872
[UNASSIGNED]
331-888
WARRENVL, IL
CYGNUS TELECOMMUNICATIONS CORPORATION - IL
09/24/2010
331-911
[UNASSIGNED]
331-950
[UNASSIGNED]
331-958
AMERITECH ILLINOIS
[UNASSIGNED]
331-959
AMERITECH ILLINOIS
[UNASSIGNED]
331-976
[UNASSIGNED]
331-999
OSWEGO, IL
CYGNUS TELECOMMUNICATIONS CORPORATION - IL
09/22/2010
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